Punch and die



J. J. CARTER PUNCH AND DIE Aug. 5 1924.

Filed May 6, 1922 5 Sheets-Sheet l Aug" 5 1924.. LSQMJgZ J. J. CARTER-PUNCH AND DIE aw-J82 A g 5 i J.J-

PUNCH AND DIE 5 Sheets-- Filed M y 19 2 Aug. 9 1924. swm

J. J. CARTER PUNCH AND DIE Filed May 6, 1922 5 Sheets-Sheet 5 by.fEYL/EHZUZ" WW2 75M Patented Aug. 5, 192.

JOHN J. CARTER, OF ANDERSON, INDIANA, ASSIGBTOIR 0 GEVERAL MOTORS COATION, ,A CORPORATION OE PUNCH AND DIE.

Application filed May 6,

T0 at; whom it may concern:

Be itknown that I, JOHN J. CARTER, a citizen of the United States ofAmerica, residing at Anderson, county of Madison, State of Indiana, haveinvented certain new and useful Improvements in Punches and Dies, ofwhich the following is a full, clear, and exact description.

Thisinvention relates to punches and dies for forming armature corelaminations and has among its objects the provision of a punch and diecapable of alarge number of operations before regrinding is necessary. Afurther object is to provide a punch and die for punching out aplurality of holes in flat material in one operation, the individualpunches being easily disassembled for grinding or replacement.

A further object of the present invention is to provide a compound punchand die adapted especially for punching out armature laminations in twooperations from a strip of sheet material, and to provide means forreadily locating the sheet material in proper relation to the punchesand dies.

Other and further objects of the resent invention will be apparent fromthe following description, reference being had to the accompanyingdrawings, wherein preferred embodiments of the present invention areclearly shown.

In the drawings:

Fig. 1 is a plan view of the punch and die constructed in accordancewith the present invention;

Fig. 2 is a side View thereof;

Fig. 3 is an end view looking in the direction of the arrow 3 in Fig. 2;

Fig. 4 is a longitudinal sectional view;

Figs. 5, 6, 7, and 8 are sectional views taken respectively on the lines55, 66, 77, 8-8, of Fig. 4; ,1

Fig. 9 is a fragmentary sectional View taken on the line 99 of Fig. 4,showing the difierent operations performed upon a strip of flatmaterial; and

Fi 10 is a plan view of an armature core punc ing produced by thedisclosed embodiment of the invention.

In the drawings 20 designates the die supporting block provided withslug holes 21 and 22. Hole 21 is counterbored at 23 to provlde a recessfor receiving the die 24.

, portion of the under the die 34 1922. serial No. 558,821.

Hole 22 is counterbored at 25 to provide a recess for receiving theflange 26 of slu block 27 which is provided with a, central? slug hole28 and a plurality of radial slug notches 29, each not/ch being closedup by a. block 30.

The hole 22 is also counterbored at 31 to provide a recess for receivinga die 32 which includes an outer member or shell 33 for receivmg aninner member 34. Die member 34 is provided with a plurality of annularlylocated radial notches 35 and with a central hole 36 and a keyway groove37. Both die members 33 and 34 are ground and when assembled together asshown in Figs. 4 and 7 these members provide a plurality of shearingedges which cooperate respectively with a plurality of punches to bedescribed.

The die 24 supports a punch guide 40 the lower surface of which isprovided with a circular recess 41 by means of which the punch 40 isadapted to fit over the die'24. The under surface of punch guide 40 isprovlded with a groove 42 so that when guide 40 is placed over the die24, a portion of the under surface of the guide 40 which is wide enoughto accommodate the desired width of fiat stock to be punched out will bespaced from the upper surface of the die 24. The members 40 and 24 aresecured together and upon the base 20 by means of screws 43 which passthrough suitable holes in these members.

Die 32 supports punch guide shell carrying punch guide 51. Guide shell50 is provided with a circular recess 52 and with a groove 53 whichcorresponds respectively with the recess 41 and the groove 42 pro videdin the punch guide 40. By means of the circular recess 52, the guideshell 50 is adapted to fit over the die shell 33, and a surface of thepunch guide shell 50 will be spaced from the upper surface of the die 32so as to provide for the passage therethrough of a strip of sheetmaterial. The punch guide 51 is provided with a plurality of radiallyextending notches in alignment with the notches 35 of and with a centralhole and keyway groove, in alignment with hole 36 and groove 37 providedin the die 34. The punch guide 50 issecured in position upon the outershell 33 of the die 32 by means of screws 55 pass' through suitableholes 56 and 57 provi spectively, and havin threaded engagement with thebase 20. 11 order to secure accurate location of these members withrespect to each other, dowel ins 58 are provided, these pins passing trough holes 59 and 60 rovided in members 50 and 33 respective y and alsoextend into holes in the base which are aligned with holes 59 and 60.

Thus far the stationary parts of the punchingdie have been described.The base 20 is adapted to be secured upon the bed of the punch press bymeans of screws passing through holes 20.

The movable parts of the pxunching die will now be described. A puncsupporting block 61 is adapted to be secured to the plunger of the punchpress by means of screws which pass through holes 61. Punch block 61 isprovided w1th holes 62 and 63 which are ali ned substantially with theslug holes 21 and 22, respectively. Hole 62 is counterbored at 64 toprovide a ledge 65, and is counterbored again at 66 to dprovide a ledge67 Hole 63 is counterbore at 68 to provide a ledge 69. A disc 70 isadapted to rest u on the ledge 67 and supports a pilot 71 which passesthrough a central aperture in screw 72 and through a central aperture inpunch 73, the latter sliding within a central bore provided in the punchguide 40 which is accurately aligned with the central bore provided inthe die 24. It is evident that the lower surface of the punch 73 and theupper surface of the die 24 provides shearing surfaces adapted to punchout a disc of flat material. The screw 72 is provided with a flange 75carrying a fplurality of s anner wrench holes 76. The ange 75 is a aptedto rest upon the ledge 65. By adjusting the screw 72 with respect to thepunch 73 the movement of the punch 73 with respect to the movement ofthe punch supporting block 61 may be varied.

It will be understood that the upper surface of the punch block 61 willbe located against the lower surface of the punch press plunger notshown. Therefore downward movement of the plunger will immediately causea movement of thepilot 71 but there will be some lost motion before thepunch 73 beings to move downwardly. In the upper position of the block61 the lower surface of the flange 75 will rest upon the flange 65 andthe upper surface of the punch 73 will be spaced from the lower surfaceof the block 61, therefore before any movement of the punch takes placethere must be a movement of the punch press plunger through a distanceequal to the distance between the ledge 65 and the lower surface of theflange 75 as shown in Fig. 4. The reason for providing this lost ed inthese members, 'remotion is that it is not necessary to have, the punch73 move through as great a distance as the pilot 71.

The counterbore 68 is adapted to receive a disc attached by screw 81 toa punch head 82 which has a central bore for receiving the punch 83.Punch 83 is provided with a head 84 seated within a counterbored recessprovided in the head 82, said unch head 84 bein confined between thedisc 80 and the hea 82. The central bore and counter-bored recessesprovided in the punch head 82 may be slightly larger in diameter thanthe outside diameter of punch 83 and its head 84, so as to permit of aslight amount of sidewise movement between the punch 83 and the head 82.Punch 83 is provided with an insert 85 (see Fig. 6) for punching out akeyway or locating notch in an armature lamination. Punch 83 and itsinsert 85 are adapted to pass respectively through the central bore andgroove in the punch guide 51 and through the bore 36 and groove 37 inthe die 34.

The punch head 82 is provided with an annular groove which is T-shapedin cross section and adapted to receive the T- shaped heads 91 of aplurality of punches 92. The dimensions of the groove are slightlygreater than the dimensions of the T-shaped heads 91 so as to permit aplay between the punches 92 and the punch head 82. The punches 92 areadapted to slide through radially extendin notches provided in the punchguide 51 an through the notches 35 provided in the die 34. The head 82is provided with a radially extending notch 95 (see Fig. 5) throughwhich the heads of the punches 92 are introduced one by one. After allthe punches have been-assembled, as shown in Fig. 5, the notch 95 isclosed by plug 96.

In the movement of the block61 the lower surface of the disc 80 restsagainst the ledge 69 so that there will be a downward motion of theblock 61 through a distance equal to the distance between the ledge 69and the disc 80 before the punch head 82 will be moved. This lost motionis preferably the same as the lost motion described in connection withpunch 73 so that the travel of the punches 83, 92 and 73 is the same.the travel of the pilot 71 being greater.

The part 50 carries a plunger 100, and part 40 carries plungers 101 and102. These plungers are normally held in the position shown in Fig. 2 bymeans of springs 103 secured in position by means of screws 104.Referring to Fig. 9, to start a series of punching operations upon astrip of sheet material 105 this material is introduced through thenotch 53 in member 50 while the plunger is pressed downwardly so as tointercept the forward edge of the strip 105. This position of theplunger 100 is indicated by the circle 100 in Fig. 9, and for the firstpunch operation the forward edge of the Y material will be located atthe line 106.

After the punch press has performed one operation the plunger 100 isreleased and the plunger 101 is pushed down as shown in Fig. 9.Thematerial 105 is moved to the left as viewed in Fig. 9 until itsforward edge strikes against the plunger 101, this portion of theforward edge being indicated by the line 107 in Fig. 9. The central hole108 and the radial holes 109 have been punched out by the previous punchoperation. The second operation of the punch press is performedresulting in similar holes being punched out of the strip 105. Theplunger 101 is released and the plunger 102'is pressed and its positionis indicated at 102" in Fig. 9. The strip 105 is moved to the left untilits forward ed e touches the plunger 102, this portion of the forwardedge being indicated at the line 110 in Fig. 9. After the third punchoperation begins the hole 108 will be substantially in alignment withthe pilot 71. As the punch press plunger descends the pointed end of thepilot 71 will enter the hole 108 before the punch 7 3 moves downwardly,said punch being maintained in its upper position by virtue of frictionbetween it and the guide 40. Before the punch commences to shear throughthe strip 105 the nilot 71 will have accurately located the hole 108 andthe radial holes 109 so that the hole 108 is concentric with the punch73. After the third operation has been performed the plungers 101, 102and 100 are not used again until a new strip of material is introducedinto the punch and die. Before the fourth punch operation is performedthe strip 105 is moved until its forward edge occupies the positionindicated by 111 in Fig. 9, this being the position when the forwardedge of the strip touches a stop pin 112 adjustably secured in positionupon a bracket 113 attached by screws 114 to the base 20. Set screws 115assist in holding the stop pin 112 in position while the nuts 116 gripopposite surfaces of the bracket 113. After the fourth punchingoperation has been performed the operator will lift the left-hand end ofthe strip 105 so that its forward edge will clear the pin 112. The strip105 is moved to the left, and, as soon as the narrow portion of material118 has cleared the pin 112, the strip is permitted to fall intohorizontal position as shown in Fig. 4 and the strip is moved to theleft until the punched out edge of the material indicated at 119(surrounding the first hole 120 to be punched out of the strip) touchesthe pin 112. Thereafter the pin 112 acts as the stop, limitin the travelof the strip 105 during the succee ing punching operations. Between eachoperation the operator lifts the left end of the strip 105 so that thematerial between adJacent punched out holes clears the stop pin, thenthe material is allowed to drop so that the stop pin will projectthrough the next hole and the movement is continued until the stristrikes he pin inside the hole.

The slugs punched out by the punch'73 become the armature corelaminations 130, (see Fig. 10) each lamination having holes 108 and anotch 108 for purpose of location on and driving by means of an armatureshaft. The ho es 109 punched out preceding the operation of the notches109 tion.

In order to secure perfect alignment of the punch guide with the diesthese members are assembled together before the finishing operations areperformed upon the surfaces which are in contact with the punches. Forexample, the arts 24 and 40 are assembled and then the finishing of thecentral bore through these members is made while the members are stillattached together. The members 20, 33, 34, 50 and 51 are assembledtogether and the central bore through members 34 and 51 is finished inone operation. Then these members are pressed on a mandrel and thenotches for receiving the punches 92 are accurately finished while thesemembers are held in substantially perfect alignment. The punch guidesare. made sufiicientl rigid and the bearing of the guiding sur aces areof sufficient length to obtain perfect alignment at all times betweenthe punches and the dies. The mechanisms for lifting the punches up anddown in the guides are not rigidly attached to the punches but provisionis made for a little side play. It is apparent therefore that it is notnecessary accurately to align the members 20 and 61 in setting upthe'punch and die in a punch press, that is, the hole 62 need not be inperfect alignment with the hole 21 and the hole 63 with the hole 22.Therefore much time is saved in setting up a punch and die which isconstructed in accordance with the present invention. Another object ofthe present invention is that relatively large punchlng operations maybe performed before regrinding of the dies and punches is of thearmature core laminanecessary. This is believed to be due to the factthat the punches are maintained in substantially perfect alignment withthe dies, and the punch press plunger cannot operate to put any side orbending strains into the punches, even though the block 61 should be outof alignment with the block 20. It has been found that the presentinvention, as compared with a punch and die constructed to perform thesame operations and having its punches rigidly connected to the punchpress plunger, will perform at least five times as many operationsbefore regrinding is necessary and the liability punch 73 become the ofbreaking punches has been reduced to the minimum.

While the form of mechanism herein shown and described constitutes apreferred form of embodiment of the inventlon, it is ali nment with thedie orifice; a punch\punch head. i gulded by the punch guide; and meansfor moving the punch into and out of the die, said means including apunch block adapted to be attached to a punch press plunger and having afloating connection with the punch.

2. In a punch and die, the combination with a die member having acentral punch receiving orifice and a plurality of radial punch receivlnorifices; of a punch guide attached to said ie and having correspondingpunch guiding orifices in ahgnment with the orifices of the die; aplurality of punches uided by said punch guide; and a punch l ieadhaving a floating connection with said punches.

3. In a punch and die, the combination with a die member having acentral punch re ceiving orifice and a rece1v1n orlfices; o a punc guideattached to said ie and havin corresponding punch punches, thedimensions of the annular groove being such as to permit of side motionof the punch head with respect to the punches; and means adapted to beattached to a punch press plunger for moving the 4. In a punch and die,the combination with a die member; of ajpunch cooperating therewith; apilot for aligning the work with the punch and die; a member supportingthe pilot and adapted to be attached to the plunger of a punch press;and means for transmitting motion from the last mentioned member to thepunch and including a lost motion connection whereby the travel of theunch will be less than the travel of the pilot.

In testimony whereof I hereto afiix my signature. 7

r JOHN J. CARTER. Witnesses:

WM. 0. Nansen, HARRY RrLoRvI. v,

luralit of radialpunch I

